Tony Hutter f2f6c18f17 zed: Misc multipath autoreplace fixes ... We recently had a case where our operators replaced a bad multipathed disk, only to see it fail to autoreplace. The zed logs showed that the multipath replacement disk did not pass the 'is_dm' test in zfs_process_add() even though it should have. is_dm is set if there exists a sysfs entry for to the underlying /dev/sd* paths for the multipath disk. It's possible this path didn't exist due to a race condition where the sysfs paths weren't created at the time the udev event came in to zed, but this was never verified. This patch updates the check to look for udev properties that indicate if the new autoreplace disk is an empty multipath disk, rather than looking for the underlying sysfs entries. It also adds in additional logging, and fixes a bug where zed allowed you to use an already zfs-formatted disk from another pool as a multipath auto-replacement disk. Furthermore, while testing this patch, I also ran across a case where a force-faulted disk did not have a ZPOOL_CONFIG_PHYS_PATH entry in its config. This prevented it from being autoreplaced. I added additional logic to derive the PHYS_PATH from the PATH if the PATH was a /dev/disk/by-vdev/ path. For example, if PATH was /dev/disk/by-vdev/L28, then PHYS_PATH would be L28. This is safe since by-vdev paths represent physical locations and do not change between boots. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tony Hutter <hutter2@llnl.gov> Closes #13023		2022-02-24 11:43:39 -08:00
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zutil_device_path_os.c	zed: Misc multipath autoreplace fixes	2022-02-24 11:43:39 -08:00
zutil_import_os.c	Correct compilation errors reported by GCC 10/11	2022-02-20 19:20:00 -08:00